Hitachi NT 65A3 Technical Data And Service Manual
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Hitachi NT 65A3 Technical Data And Service Manual

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MODEL
NT 65A3
Hitachi
Power Tools
TECHNICAL DATA
FINISH NAILER
AND
NT 65A3
SERVICE MANUAL
N
LIST No. E012
Aug. 2003
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT

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Summary of Contents for Hitachi NT 65A3

  • Page 1 MODEL NT 65A3 Hitachi Power Tools TECHNICAL DATA FINISH NAILER NT 65A3 SERVICE MANUAL LIST No. E012 Aug. 2003 SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT...
  • Page 2 REMARK: Throughout this TECHNICAL DATA AND SERVICE MANUAL, a symbol(s) is(are) used in the place of company name(s) and model name(s) of our competitor(s). The symbol(s) utilized here is(are) as follows: Competitors Symbols Utilized Company Name Model Name D51256K DEWALT...

  • Page 3: Table Of Contents

    10-3. Disassembly and Reassembly of the Control Valve Section ............. 30 10-4. Disassembly and Reassembly of the Magazine Section and the Driving Section ..... 32 11. INSPECTION AND CONFIRMATION AFTER REASSEMBLY ..........36 12. STANDARD REPAIR TIME (UNIT) SCHEDULES ..............37 Assembly Diagram for NT 65A3...

  • Page 4: Product Name

    NT 65A2 is provided with the contact actuation mechanism only). The grip tape wound around the handle of the body was changed to the grip rubber that is common to the Model NR 83A2. The new Model NT 65A3 has the same construction as the current Model NT 65A2 including the well-reputed tool-less clogged nail release mechanism, driving force, response and balance.

  • Page 5: Specifications

    Grease (ATTOLUB No. 2) (500 g (1.1 lbs.)) (Code No. 317918) Grease (MULTEMP PS No. 2) (30 g (0.07 lbs.)) (Code No. 939301) 5-2. Nail Selection The Model NT 65A3 utilizes small-head, T-shaped nails (finish nails) collated by adhesive. Applicable nails are shown below. CAUTION: Ensure that nails are as specified in Fig.

  • Page 6: Explanation Of The Nailing Operation

    5-3. Explanation of the Nailing Operation To meet the requirements of "ANSI SNT-101-2002", the Model NT 65A3 is equipped with a nailing operation switching device at the valve portion as shown in the figures below. Use SINGLE ACTUATION MECHANISM (SINGLE SEQUENTIAL ACTUATION MECHANISM) or CONTACT ACTUATION MECHANISM in accordance with the work to be performed.

  • Page 7: Nail Driving Force

    For example, when driving a 65 mm (2-1/2") nail into a hard wood workpiece with the Model NT 65A3, a pressure of about 5.5 kgf/cm (78 psi, 5.4 bar) allows the nailer to drive the nail flush with the surface.

  • Page 8: Optional Accessory: Full Sequential Actuation Mechanism Kit

    Full sequential actuation mechanism kit (sequential trip mechanism kit) (Code No. 884178) is provided as an optional accessory for the Model NT 65A3. When using this optional accessory, a nail is driven when pressing the pushing lever first against a workpiece and then pulling the trigger, and no nail is driven when pulling the trigger first and then pressing the pushing lever against a workpiece (single-shot operation).

  • Page 9: Precautions In Sales Promotion

    7. PRECAUTIONS IN SALES PROMOTION In the interest of promoting the safest and most efficient use of the Model NT 65A3 Nailer by all of our customers, it is very important that at the time of sale, the salesperson carefully ensures that the buyer seriously recognizes the importance of the contents of the Handling Instructions, and fully understands the meaning of the precautions listed on the Warning Label attached to each tool.

  • Page 10: Related Laws And Regulations

    7-3. Related Laws and Regulations As nailers or staplers are designed to instantaneously drive nails or staples, there is an ever-present danger of misfiring and subsequent possible serious injury. Accordingly, close attention in handling is absolutely necessary at all times. Carefully ensure that the customer is fully aware of the precautions listed in the Handling Instructions provided with each unit.

  • Page 11: Mechanism And Operation Principle

    The basic construction of the Model NT 65A3 is the same as that of the Model NT 65A2. The magazine section is common to that of the Model NT 65A2. However, most of the parts of the control valve section were changed to provide the single actuation (single sequential actuation)/contact actuation mechanisms in order to correspond to the modification of the ANSI standard.
  • Page 12 The <Bold> numbers in the figure below correspond to the numbers in "8-3. Operation Principle". Safety valve portion Trigger valve portion Trigger Switching device (Valve sleeve (A)) Valve bushing Plunger (B) Control valve section Exhaust Valve < 2 > Exhaust cover Accumulator <1>...

  • Page 13: Interchangeability

    Model NT 65A2 are described in detail. (1) Output section Be careful not to make mistakes in mounting the following parts that were changed for the Model NT 65A3 because these parts are similar to those of the Model NT 65A2 but not interchangeable.
  • Page 14 The parts of the output section except the above are common to those of the Model NT 65A2. (2) Driving section Parts that were changed for the Model NT 65A3 and not interchangeable with those of the Model NT 65A2 though they are similar to those of the Model NT 65A2...
  • Page 15 (3) Control valve section Be careful not to make mistakes in mounting the following parts that were changed for the Model NT 65A3 because these parts are similar to those of the Model NT 65A2 but not interchangeable. Part NT 65A3...
  • Page 16 (Continued) Part NR 83A2 NR 83A Caution *Outside diameters at both ends These parts are exclusive to Plunger (B) Spring are greater. the Model NT 65A3. [51] 8 mm dia. Overall 6.6 mm length dia. 18.4 mm 8 mm dia.

  • Page 17: Operation Principle

    8-3. Operation Principle The operation of the Model NT 65A3 is illustrated and described in Figs. 4 through 9. The <Bold> numbers in the descriptions correspond to the item numbers shown in the construction illustrated in Fig. 3. In Fig. 5, Fig. 7, Fig. 8 and Fig.
  • Page 18 Compressed air is applied Although air pressure is applied to both the to the upper side of the upper and lower sides of the cylinder, the Exhaust Valve < 2 >, forcing cylinder is forced downward due to the larger it downward and closing Cylinder ring effective area of the upper side.
  • Page 19 Air pressure is applied in the shaded areas in the illustration, and each component is held in the position illustrated. If the operator's grip is loosened, air will leak. At there is no o-ring installed here, a very small amount of air will leak from the slight clearance between the components.
  • Page 20 The air pressure on the upper surface of the Exhaust Valve < 2 > is released, and the exhaust valve is pushed upward by the air pressure within the cylinder. This opens the Exhaust Vent < 3 >, and the air pressure in the cylinder is discharged from the nailer.
  • Page 21 When the switching device is set to the single actuation mode, the compressed air cannot be released from the upper portion of the piston and the air passage until the trigger is released because the valve exhaust vent II is blocking even if only the pushing lever returns.
  • Page 22 Valve Exhaust Vent II When the switching device is set to the contact actuation mode, the compressed air in the upper portion of the piston and the air passage is released from the valve exhaust vent II if the pushing lever returns. Therefore, the piston returns to the original position and the next nail can be driven.

  • Page 23: Troubleshooting Guide

    9. TROUBLESHOOTING GUIDE 9-1. Troubleshooting and Correction Problem Possible cause Inspection method Remedy 1) Nails cannot <Nails> be driven. Magazine is not loaded with Check if the magazine is Use specified nails. specified genuine nails. normally loaded with Remove the abnormal nails specified nails.
  • Page 24 Problem Possible cause Inspection method Remedy < Output section > Set the single actuation/ Adjust for 5 to 8.5 kgf/cm Air pressure too low. contact actuation selector to Piston O-ring is worn or Replace the piston o-ring. the contact actuation. Pull damaged.
  • Page 25 Problem Inspection method Remedy Possible cause 3) Head of a nail Air pressure is too low. Adjust for 5 to 8.5 kgf/cm driven into a Workpiece is very hard. Drive a nail into soft wood Do not use unspecified workpiece workpiece and check if the workpieces.

  • Page 26: Possible Causes And Countermeasures For Air Leakage

    9-2. Possible Causes and Countermeasures for Air Leakage Primary areas of the air leakage Air inlet --- 23 ---...
  • Page 27 Inspection priorities: In the table below, possible causes of air leakage and their repair procedures are marked in accordance with the likelihood of possible failure. (1) First priority items are marked with an asterisk ( ). (2) Second priority items (seal portions) are marked with a double circle ( (3) Remaining items are marked with a single circle ( ).

  • Page 28: Disassembly And Reassembly

    (MULTEMP PS No. 2 Code No. 939301) must be applied to the O-rings and the sliding portions of the control valve section. Do not scratch the O-rings nor adhere dust to them when mounting. Oil required: Hitachi pneumatic tool lubricant 1 oz (30 cc) oil feeder (Code No. 877153) 4 oz (120 cc) oil feeder (Code No.

  • Page 29: Disassembly And Reassembly Of The Output Section

    10-2. Disassembly and Reassembly of the Output Section (1) Piston Bumper [21] and the related parts Tools required 3 mm dia. (0.118") roll pin remover 4 mm (0.157") hexagonal bar wrench 8 mm (0.315") spanner (a) Disassembly (Refer to Fig. 10.) Extract the Roll Pin D3 x 30 [38] with a roll pin remover.
  • Page 30 Hex. Socket Hd. Bolt M5 x 18 [31] Washer [32] Body Ass'y [19] Washer M5 [50] Plunger (B) Spring [51] Plunger (B) [52] Piston Bumper [21] Roll Pin D3 x 30 [38] Nylon Nut M5 [60] Nose Ass'y [22] Nylock Hex. Socket Hd.
  • Page 31 (b) Reassembly Reassembly can be accomplished by following the disassembly procedures in reverse. However, special attention should be given to the following items: Be sure to check that the Cylinder [13] is provided with a 1-mm dia. hole (Fig. 15) before reassembly. Note that mounting a wrong cylinder may cause a malfunction.
  • Page 32 1-mm dia. hole 1-mm dia. hole Cross-sectional view Fig. 15 (3) Head Cap [7] and Exhaust Valve [6] Tool required 4 mm (0.157") hexagonal bar wrench (a) Disassembly (Refer to Fig. 16.) As described in paragraph 10-1-(2), remove the Exhaust Cover [3]. Remove the two Hex.

  • Page 33: Disassembly And Reassembly Of The Control Valve Section

    10-3. Disassembly and Reassembly of the Control Valve Section Tools required 3 mm dia. (0.118") roll pin remover Flat-blade screwdriver [J-125 valve bushing spanner (special repair tool, Part No. 97893) is recommended in place of a screwdriver.] Setting pin (with a rounded tip) (a) Disassembly (Refer to Fig.
  • Page 34 Valve Packing [53] Urethane Ball (C) D7.14 [54] Plunger Spring [41] Trigger Valve Bushing [57] Plunger (A) [42] O-ring (I.D 10.7) [44] Trigger Plunger [58] Valve Bushing [45] O-ring (P-9) [46] Roll Pin D3 x 30 [38] Valve Sleeve [47] Trigger [59] Plunger O-ring [49] Washer M5 [50]...

  • Page 35: Disassembly And Reassembly Of The Magazine Section And The Driving Section

    10-4. Disassembly and Reassembly of the Magazine Section and the Driving Section (1) Guide Plate [25], Pushing Lever [65] and the related parts Tools required 4 mm (0.157") hexagonal bar wrench 3 mm dia. (0.118") roll pin remover 4 mm dia. (0.157") roll pin remover (a) Disassembly (Refer to Fig.
  • Page 36 (2) Magazine Ass'y [63], Nail Feeder [67] and the related parts Tools required 4 mm (0.157") hexagonal bar wrench 8 mm (0.315") spanner 3 mm dia. (0.118") roll pin remover [CAUTION] When handling the Ribbon Spring [66], wear approved eye protector without fail. (a) Disassembly (Refer to Fig.
  • Page 37 Hex. Socket Hd. Bolt M5 x 18 [31] Washer [32] Nylock Hex. Socket Hd. Bolt M5 x 12 Handle Arm [61] [29] Magazine Cover [62] Nylon Nut M5 [60] Sleeve (A) [30] Nylock Bolt (W/Flange) M5 x 8 [68] Nose Ass'y [22] Ribbon Spring [66] Nail Feeder [67] Hex.
  • Page 38 Handle Arm [61] Body Ass'y [19] Nose Ass'y [22] Magazine Ass'y [63] Fig. 22 Magazine Ass'y [63] No space Nose Ass'y [22] Fig. 23 --- 35 ---...

  • Page 39: Inspection And Confirmation After Reassembly

    (120 psi). Check that there is no air leakage and the Model NT 65A3 does not operate (i.e., check that the Piston [9] does not come out of the Nose Ass'y [22] tip (outlet of nails) when it is left for five seconds or more).

  • Page 40: Standard Repair Time (Unit) Schedules

    12. STANDARD REPAIR TIME (UNIT) SCHEDULES Variable 60 min. MODEL Fixed Work Flow NT 65A3 Exhaust Cover Gasket x 2 Exhaust Valve Head Cap Nose Ass'y Magazine Ass'y Nail Feeder Ribbon Spring General Assembly Body Ass'y Pushing Lever Cylinder Spring (B)
  • Page 41 Hitachi Power Tools LIST NO. E012 PNEUMATIC TOOL PARTS LIST FINISH NAILER 2003 • • Model NT 65A3 (E1)
  • Page 42 PARTS NT 65A3 ITEM CODE NO. DESCRIPTION REMARKS USED 949-757 HEX. SOCKET HD. BOLT M5X20 (10 PCS.) 876-179 TOP COVER 877-917 EXHAUST COVER 876-176 GASKET (B) 876-178 GASKET (C) 884-173 EXHAUST VALVE 878-026 HEAD CAP 876-174 PISTON O-RING 882-402 PISTON...
  • Page 43 PARTS NT 65A3 ITEM CODE NO. DESCRIPTION REMARKS USED 884-175 PLUNGER (B) 878-734 VALVE PACKING 875-645 URETHANE BALL (C) D7.14 875-638 O-RING (S-12) 875-644 VALVE PLATE 877-335 TRIGGER VALVE BUSHING 878-121 TRIGGER PLUNGER 876-203 TRIGGER 877-371 NYLON NUT M5 882-405...

  • Page 44: Standard Accessories

    NT 65A3 STANDARD ACCESSORIES ITEM CODE NO. DESCRIPTION REMARKS USED 944-458 HEX. BAR WRENCH 4MM 881-751 NOSE CAP (A) 875-769 SAFETY GLASSES 884-180 CAUTION TAG 884-120 LEAFLET OPTIONAL ACCESSORIES ITEM CODE NO. DESCRIPTION REMARKS USED 881-768 GRIP TAPE (A) 880-407...

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